Translates to;
Someone has said something that fits my preconceived prejudices. This must therefore be correct and all other probable answers are wrong. Dowie is a bad man. Bad dowie. Bad.
I literally asked him what he meant by itAdditionally, if dowie was not referring to this definition, or was not even aware of it, he still meant it this way. And any protestations on his part are further evidence of his guilt.